What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and machines to parse. It has become the standard format for API responses, configuration files, and data storage in modern web development.
Why Format JSON?
Minified JSON — what most APIs return — is hard to read. A JSON formatter adds proper indentation, line breaks, and colour highlighting, making it easy to spot missing brackets, incorrect data types, or unexpected structures. This is essential for debugging API responses.
Common JSON Errors
- Missing comma: Between properties in an object or items in an array
- Trailing comma: After the last property or item (invalid in standard JSON)
- Missing quotes: Property names must be enclosed in double quotes
- Single quotes: JSON only allows double quotes for strings
- Extra comma: At the end of a list
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